Sash-pulley



THOMAS M. KENNA, OF NEYV HAVEN, CONNECTICUT.

SASH-PULLEY.

SPECIFICATION forming part of Letters Patent No. 329,317, dated October 27, 1885.

Application filed March 5, 1885. Serial No. 157,831.

To (ZZZ whom it may concern.-

Be it known that I, THOMAS M. KENNA, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Improvement in Sash-Pulleys, of which the following is a specification.

My invention relates to an improvement in sash-pulleys, and has for its object to pro: vide a mountingor case that can readily be inserted and held in a round hole countersink bored in the window-frame, thereby avoiding the expense of mortising the frame for the reception of the rectangular pulley-case hitherto ordinarily used.

The invention consists in the novel pulleycase hereinafter more fully described and claimed.

In the accompanying drawings, Figure I shows my improved sash -pulley case as it appears inserted in the window-frame. Fig. 2 is a front view of the case detached from the frame. Fig. 3 is a rear view of the same. Fig. 4 is a section on the line 00 m, Fig. 3; and Fig. 5 is a side view of the sash-pulley.

In an ordinary windowframe there are two sashes, which, when operated by weight and cords, involve the mounting of a pair of grooved pulleys at each side of the frame for the travel of the respective cords. Fig. I shows such a pair of pulleys secured in a frame with my improved case. Both pulleys A are arranged in a single case, cast in one piece, of the form shown, which consists, essentially, of a circular front or flange, B, on the back of which vertical brackets C are formed for the support of the pulley-arbor. The pulleys are arranged one upon each side of the center of the front or flange, each between a pair of brackets, in a space, 6, which extends through the flange, allowing the pulleys to be located so that their respective cords hang close to the front or face of the case. The pulleys are supported upon asingle arbor,d,which is fitted through the several brackets and riveted over at the ends. Centrally in the circular front of the case a rectangular groove, f, is formed parallel to the pulleys, and of corresponding width and depth to avertical groove, planed in the window-jambs for the reception of a wooden strip, h, which divides the guideways in which the sashes travel. The sides 7; and the bottom m of the groove f are formed with open spaces to lighten the cast- (No model.)

ings. Ribs n extend from the sides 2' around the ends of the spaces 6, connecting each pair of brackets C. These bearing surfaces or guides are arranged equidistant from the periphery of the flange, and are adapted to enter and bear against the walls of a circular hole bored in the window-jamb.

Constructed as above described and shown, the method of inserting and securing my improved sash-pulley in a window-frame is as follows: A circular hole is bored through the top part of the window-jamb P, which is adapted to receive the bearing surfaces or guides t. The hole thus formed is next countersunk to correspond with the diameter and depth of the circular flange. The pulley-case is then driven tightly into the hole, and the countersink receives the flange. The case is inserted with'the groove f coincident with the groove 9 in the jamb, and the division-strip h is received in the continuous groove thus formed. Thus fitted, the pulley -case is securely held in the jainb. Thewedging action of the bearing-surfaces or guides tholds the case rigidly in place and secures a perfect fit. As the bearing area of the guides is limited and shaped to indent the jamb, they can be driven in tightly without danger of the jamb being subsequently split by shrinking. The parting or division strip is preferably cut apart a little below the pulley-case, so that the case can be taken from the jamb without removing the strip h from the whole length of the window.

It is evident that the slot f in the case may be omitted, and the case otherwise prevented from turning; but the form of pulley-case shown is preferable, as the only expense of fitting it in a window-frame is the work of boring a simple round hole and countersink, as described.

\Vhat I claim, and desire to secure by Letters Patent, is-

A double sash-pulley case having acircular front or flange provided with bearingsurfaces or guides arranged equidistant from the pe riphery of the flange, and adapted to enter and bear against the walls of a circular hole bored in the windoW-jamb, substantially in the manner described.

THOS. M. KENNA.

Witnesses:

JOHN H. WHITING, LEWIS H. TYRRELL. 

